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250 ISCAR DEEP HOLE DRILLINGExplanation of Solid Carbide Gundrills DescriptionExample:STCGD %u2013 05500 %u2013 0200 %u2013 05 %u2013 IC908CGD %u2013 05520 %u2013 0200 %u2013 05 %u2013 C P %u2013 IC908SPCGD %u2013 05520 %u2013 0500 %u2013 02051-01 %u2013 IC9081 2 3 4 5 6 71 Designation of Drilling HeadSTCGD %u2013 standard gundrill with brazed tipCGD %u2013 semi-standard gundrill with brazed tipSPCGD %u2013 special gundrill with brazed tip2 Cutting Diameter (DC)DC3 Drill Lengthdrill length4 For STCGD or GD %u2013 Code of Driver TypeFor SPCGD %u2013 drawing no.5 Drilling Head ProfileAccording to table 6.11.1.26 Finishing OperationP = polishR = rough7 Carbide GradeAvailable carbide grades: IC08, IC908, IC508, IC308, IC208Advantages of the Solid Carbide Gundrill: %u2022 Drilling precision of IT7 to IT9%u2022 Excellent straightness and concentricity%u2022 Maintains high precision hole center alignment%u2022 Surface roughness of 0.4-1.6 Ra is easily obtained%u2022 Reboring operation is often unnecessary